A circular sector-shaped dipole antenna with meandered arms based on an artificial magnetic conductor (AMC) is proposed in this study. A compact unit cell of the AMC operating within 19–485 MHz is designed using a ferrite material, which exhibits high-permeability characteristics in the high-frequency (HF), very-high-frequency (VHF), and ultra-high-frequency (UHF) bands. The configuration of the meandered arms is optimally designed using a binary genetic algorithm, so that the antenna combined with the AMC meets the voltage standing wave ratio (VSWR) specification of 3.5:1 or less within the HF, VHF, and UHF bands. The proposed antenna with the AMC is fabricated and measured. The measured VSWR frequency bandwidth (3.5:1 or less) is 25.8:1 (14–361 MHz), and the measured result matches with the simulated result well. Furthermore, to verify the performance of the proposed antenna with the AMC, the measured received power results are compared with a commercial reference antenna operating in HF, VHF, and UHF bands.

한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

This paper presents a compact dual circularly polarized (CP) stacked‐patch antenna and a corresponding sequentially rotated 4 × 4 array for S‐band satellite communication applications. The driven patch is excited through two orthogonal H‐shaped slots that couple energy from the feedline, while a parasitic patch placed above the driven patch and separated by an airfoam spacer enhances the impedance bandwidth and radiation performance. A planar branch‐line hybrid coupler provides quadrature‐phase excitation to the aperture slots, enabling LHCP or RHCP operation through selective port excitation. The fabricated antenna exhibits measured −10 dB impedance bandwidths of 26.95% and 23.26% for Port 1 and Port 2, respectively, with a 3 dB axial‐ratio bandwidth spanning 1.90–2.40 GHz and a peak realized gain of 7.0 dBic, covering both the S‐band downlink (1.98–2.01 GHz) and uplink (2.17–2.20 GHz) frequency bands. The corresponding dual‐CP 4 × 4 array maintains active reflection coefficients below −10 dB at broadside and during beam scanning up to 30°, while preserving stable circular polarization, low sidelobe levels, and high realized gain. These results demonstrate a compact, array‐compatible dual‐CP antenna solution offering wide bandwidth, high polarization purity, and reliable beam‐scanning performance for modern S‐band satellite communication systems.